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Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
FreeCAD - An open-source parametric 3D modeler
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Ayam - Ayam is a free 3D modelling environment for the RenderMan interface, distributed under the BSD...
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.